31455553121 has 4 divisors (see below), whose sum is σ = 31456495152. Its totient is φ = 31454611092.

The previous prime is 31455553093. The next prime is 31455553193. The reversal of 31455553121 is 12135555413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31455553121 - 2¹⁰ = 31455552097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31455555121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 419015 + ... + 488348.

It is an arithmetic number, because the mean of its divisors is an integer number (7864123788).

Almost surely, 2^31455553121 is an apocalyptic number.

It is an amenable number.

31455553121 is a deficient number, since it is larger than the sum of its proper divisors (942031).

31455553121 is an equidigital number, since it uses as much as digits as its factorization.

31455553121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942030.

The product of its digits is 45000, while the sum is 35.

The spelling of 31455553121 in words is "thirty-one billion, four hundred fifty-five million, five hundred fifty-three thousand, one hundred twenty-one".